MAX686EEE+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX686EEE+
DAC-Controlled Boost Inverter LCD Bias Supply with Internal Switch
General Description
The MAX686 DAC-controlled boost/inverter IC converts
a positive input voltage to a positive or negative LCD
bias voltage up to +27.5V or -27.5V. The device features
an internal N-channel MOSFET switch, programmable
current limiting, and an internal 6-bit digital-to-
analog converter (DAC) for digital adjustment of the
output voltage. It comes in a small 16-pin QSOP pack-
age (same size as an 8-pin SO).
The MAX686 uses a current-limited, pulse-frequency-
modulation (PFM) control scheme to provide high effi-
ciency over a wide range of load conditions. Its high
switching frequency (up to 300kHz) allows the use of
small external components.
An LCDONoutput allows the LCD bias voltage to be
automatically disabled when the display logic voltage is
removed, protecting the display. The MAX686 has a
+2.7V to +5.5V input voltage range for the IC, and a
+0.8V to +27.5V input voltage range for the inductor.
Typical quiescent supply current is 65μA. Shutdown
current is 1.5μA.
The MAX686 offers high-level integration to save space,
reduce power consumption, and increase battery life,
making it an excellent choice for battery-powered
portable equipment. The MAX629 is similar to the
MAX686, except that it does not contain a built-in DAC.
Both devices have evaluation kits to facilitate designs.
Applications
Positive or Negative LCD Bias
Personal Digital Assistants
Notebook Computers
Portable Data-Collection Terminals
Palmtop Computers
Varactor Tuning Diode Bias
____________________________FeaturesInternal 500mA, 28V N-Channel Switch
(no external FET required)Adjustable Output Voltage to +27.5V or -27.5V6-Bit DAC-Controlled Output VoltageUp to 90% EfficiencySmall 16-Pin QSOP Package
(Same size as 8-pin SO)Power-OK Indicator65μA Quiescent Current1.5μA Shutdown CurrentUp to 300kHz Switching Frequency
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
19-1327; Rev 1; 2/98
PART
MAX686C/D
MAX686EEE-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE
Dice*
16 QSOP
EVALUATION KIT
AVAILABLE
Ordering Information
*Dice are specified at TA= +25°C, DC parameters only.
Functional Diagram appears at end of data sheet.
MAX686
VCC
VDD
VOUT22μHVIN = 0.8V TO 27.5V
SHDN
POL
GNDPGND
DACOUT
LCDON
REF
POK
ISET
0.1μF
MBR0530L
ON/OFF
DAC CONTROL
VCC = 2.7V TO 5.5V
0.1μF
Typical Operating Circuit
PGNDLX
N.C.
LCDON
GND
POK
REF
TOP VIEW
MAX686
QSOP
ISET
POL
VDDVCC
SHDN
DACOUT
Pin Configuration
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= VDD= VIN= +5V, CREF= 0.1μF, TA= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage
VCC, ISET, POK, POL, SHDN,
UP, DN, VDDto GND...........................................-0.3V to +6V
FB, REF, DACOUT to GND.......................-0.3V to (VCC+ 0.3V)
PGND to GND.....................................................-0.3V to +0.3V
LX, LCDONto GND..............................................-0.3V to +30V
Current
LX (sinking).....................................................................600mA
LCDON(sinking)...............................................................10mA
Continuous Power Dissipation (TA= +70°C)
QSOP (derate 8.30mW/°C above +70°C)......................667mW
Operating Temperature Ranges
MAX686C/D..........................................................0°C to +70°C
MAX686EEE.......................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
SHDN= GND
POL = GND, VFB= 1.3V, IDACOUT= 0mA
Boost configuration, VOUT= 27.5V,
ILOAD= 0mA to 5mA
Boost configuration, VOUT= 27.5V,
ILOAD= 5mA, VCC= VDD =2.7V to 5.5V
Rising or falling
CONDITIONS1.34ISHDNShutdown Current 65125ICC+ IDD2.75.5VCC, VDDSupply Voltage (Note 1)
Supply Current 28VLXLX Voltage Range
%/mA0.01Load Regulation
%/V0.1Line Regulation2.102.52.65VLOCKVCCUndervoltage Lockout100VCCUndervoltage Lockout
Hysteresis0.51.52.1VRESETVCCDAC Reset Threshold
UNITSMINTYPMAXSYMBOLPARAMETER
ISET = VCCA0.420.500.58ILXLX Switch Current LimitISET = GND0.210.250.29
VLX= 28VμA1.5ILXLEAKLX Leakage Current
VCC= VDD = 5V, ILX= 100mAΩ0.61.2RLXLX On-ResistanceVCC= VDD = 3.3V, ILX= 100mA0.81.681012tONMaximum LX On-Time
POL = GND, VFB> 1.2V
tOFFMinimum LX Off-TimePOL = VCC, VFB< 0.15V2.83.54.2
POL = GND, VFB< 0.8V456
POL = VCC, VFB> 0.4V456
Voltage applied to L1V0.8VOUTVINInput Voltage
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
IREF= 0μA to 25μA, CREF= 0.1μF
VCC= VDD= 2.7V to 5.5V, no load
0μA < IDACOUT< 20μA
-50μA < IDACOUT< 0μA
IREF= 0μA to 50μA, CREF= 0.47μF
CONDITIONS110REF Load Regulation1.2251.2501.275VREFREF Output Voltage015VZSZero-Scale Output VoltageVREF -
VREFVREF+
0.0150.015VFSFull-Scale Output Voltage
1.5±50IFBFB Input Bias Current
UNITSMINTYPMAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(VCC= VDD= VIN= +5V, CREF= 0.1μF, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
POL = GND
POL = VCC1.2251.2501.275VFBFB Set PointmV-15015±50IPOKPOK Input Current
VPOKrisingV1.1001.1251.150VPOKPOK Threshold12POK Hysteresis
VLCDON= 0.4V, VPOK= 1.25VmA26ILCDONLCDONSink Current
VLCDON= 28V, VPOK= GNDμA0.021LCDONLeakage Current
bits6Resolution
Mid-scale = VREFx 32/63%-22MSAMid-Scale Accuracy
Guaranteed monotonicLSB-11DNLDifferential Nonlinearity1.5RDACOUTOutput Resistance in Shutdown
2.7V < VCC= VDD< 5.5VV0.7VILInput Low Level
2.7V < VCC= VDD< 5.5VV2.4VIHInput High Level±1IBIASInput Bias Current
UP, DN, TA= +25°Cμs1tPWHPulse Width High
UP, DN, TA= +25°Cμs1tPWLPulse Width Low
UP, DN, TA= +25°Cμs1tPWSPulse Separation
REFERENCE AND FB INPUT
POWER OK COMPARATOR, LCDONOUTPUT
DAC OUTPUT (Notes 2, 3)
LOGIC INPUTS: POL, ISET, UP, DN, SHDN
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
ISET = VCCA0.40.6
SHDN= GND
ILXLX Switch Current Limit
POL = GND, VFB = 1.3V, IDACOUT= 0mA
ISET = GND
VCC= VDD= 5V, ILX= 100mA
VLX= 28V
Rising or falling1.5
CONDITIONS
ILXLEAKLX Leakage Current
RLXLX On-ResistanceVCC= VDD= 3.3V, ILX= 100mA1.67.512.5tONMaximum LX On-Time
POL = GND, VFB> 1.2V
tOFFMinimum LX Off-TimePOL = VCC, VFB< 0.15V2.84.2
POL = GND, VFB< 0.8V3.86.2
POL = VCC, VFB> 0.4V3.86.24ISHDNShutdown Current125ICC+ IDD2.75.5VCC, VDDSupply Voltage (Note 1)
Supply Current28VLXLX Voltage Range2.102.65VLOCKVCCUndervoltage Lockout
UNITSMINTYPMAXSYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS
(VCC= VDD= VIN= +5V, CREF= 0.1μF, TA= -40°C to +85°C, unless otherwise noted.) (Note 4)
Note 1:The MAX686 requires a supply voltage at VCC= VDDbetween +2.7V and +5.5V; however, the voltage that supplies the
inductor can vary from +0.8V to +27.5V, depending on circuit operating conditions.
Note 2:The DAC output is set to its midpoint value at power-on.
Note 3:The DAC setting is guaranteed to remain valid as long as VCCis greater than the VCC DAC Reset Threshold.
Note 4:Specifications to -40°C are guaranteed by design, not production tested.
VCC= VDD= 2.7V to 5.5V, no loadV1.221.28VREFREF Output Voltage
IREF= 0μA to 25μA, CREF= 0.1μFmV10REF Load Regulation
POL = GNDV1.221.28VFBFB Set Point POL = VCC-1515±50IFBFB Input Bias Current
VPOKrisingV1.051.20VPOKPOK Threshold±50IPOKPOK Input Current
VLCDON= 0.4V, VPOK= 1.25VmA2ILCDONLCDONSink Current
Voltage applied to L1V0.8VOUTVINInput Voltage
-50μA < IDACOUT< 0μAVVREF -VREF +
0.020.02VFSFull-Scale Output Voltage
0μA < IDACOUT< 20μAmV015VZSZero-Scale Output Voltage
Bits6Resolution
Mid-scale = VREFx 32/63%-33MSAMid-Scale Accuracy
2.7V < VCC= VDD < 5.5VV0.7VILInput Low Level
2.7V < VCC= VDD < 5.5VV2.4VIHInput High Level±1IBIASInput Bias Current
REFERENCE AND FB INPUT
POWER OK COMPARATOR, LCDONOUTPUT
LOGIC INPUTS: POL, ISET, UP, DN, SHDN
DAC OUTPUT (Notes 2, 3)
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
EFFICIENCY vs. LOAD CURRENT
(VOUT = +24V)
AX686 TOC01
LOAD CURRENT (mA)
(%
A: VIN = 12V, ISET = VCC
B: VIN = 12V, ISET = GND
C: VIN = 5V, ISET = VCC
D: VIN = 5V, ISET = GND
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCCEF
EFFICIENCY vs. LOAD CURRENT
(VOUT = +12V)
AX686 TOC
LOAD CURRENT (mA)
(%
A: VIN = 9V, ISET = VCC
B: VIN = 9V, ISET = GND
C: VIN = 5V, ISET = VCC
D: VIN = 5V, ISET = GND
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCCCA
EFFICIENCY vs. LOAD CURRENT
(VOUT = -12V)
X686 TOC03
LOAD CURRENT (mA)
(%AD
C: VIN = 5V, ISET = GND
D: VIN = 5V, ISET = VCC
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
A: VIN = 9V, ISET = GND
B: VIN = 9V, ISET = VCC
__________________________________________Typical Operating Characteristics
(Circuits of Figures 1 and 2, VCC= VDD= VIN= +5V, L1 = 22μH, SHDN= VCC, CREF= 0.1μF, TA= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = -18V)
AX686 TO
C04
LOAD CURRENT (mA)
(%D
A: VIN = 9V, ISET = GND
B: VIN = 9V, ISET = VCC
C: VIN = 5V, ISET = GND
D: VIN = 5V, ISET = VCC
E: VIN = 3V, ISET = GND
F: VIN = 3V, ISET = VCC
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (VOUT = +12V, +24V)
AX686 TOC05
INPUT VOLTAGE (V)
(m
A: VOUT = 12V, ISET = VCC
B: VOUT = 12V, ISET = GND
C: VOUT = 24V, ISET = VCC
D: VOUT = 24V, ISET = GND
MAXIMUM OUTPUT CURRENT vs.
INPUT VOLTAGE (VOUT = -12V, -18V)
AX686 TOC06
INPUT VOLTAGE (V)
(mC
A: VOUT = -12V, ISET = VCC
B: VOUT = -18V, ISET = VCC
C: VOUT = -12V, ISET = GND
D: VOUT = -18V, ISET = GND
B & D
A & C
VOUT
50mV/div
AC-COUPLED
VOUT
50mV/div
AC-COUPLEDISET = VCC
ISET = GND
OUTPUT VOLTAGE RIPPLE
MAX686 TOC09
20μs/div
VOUT = 24V
ILOAD = 5mA
INPUT CURRENT
vs. INPUT VOLTAGE
X686 TOC07
INPUT VOLTAGE (V)
(μ
VCC = VIN = VDD
INPUT CURRENT = ICC + IDD
VOUT = 18V, NO LOAD
REFERENCE VOLTAGE
vs. LOAD CURRENT
AX686
TOC
LOAD CURRENT (μA)
(V
VIN = VCC = 5V
CREF = 0.1μF
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_____________________________Typical Operating Characteristics (continued)
(Circuits of Figures 1 and 2, VCC= VDD= VIN= +5V, L1 = 22μH, SHDN= VCC, CREF= 0.1μF, TA= +25°C, unless otherwise noted.)
VOUT
50mV/div
AC-COUPLED
LINE-TRANSIENT RESPONSE
(ISET = VCC)
MAX686 TOC10
5ms/div
VCC = VDD =VIN
VOUT
50mV/div
AC-COUPLED
LINE-TRANSIENT RESPONSE
(ISET = GND)
MAX686 TOC10A
5ms/div
VOUT = 24V
ILOAD = 5mA
VCC = VDD = VIN
VOUT
IOUT
20mV/div
AC-COUPLED
100μA
5mA
LOAD-TRANSIENT RESPONSE
(ISET = GND)
MAX686 TOC11
2ms/div
VOUT = 24V
VOUT
IOUT
50mV/div
AC-COUPLED
100μA
5mA
LOAD-TRANSIENT RESPONSE
(ISET = VCC)
MAX686 TOC12
2ms/div
VOUT = 24V
VOUT
5V/div
18.7V
POWER-UP RESPONSE
(POSITIVE CONFIGURATION)
MAX686 TOC13A
500μs/div
SHDN
2V/div
ISET = VCC
RL = 4.7kΩ
VOUT
5V/div
18.7V
POWER-DOWN RESPONSE
(POSITIVE CONFIGURATION)
MAX686 TOC13B
5ms/div
SHDN
2V/div
ISET = VCC
RL = 4.7kΩ
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
_____________________________Typical Operating Characteristics (continued)
(Circuits of Figures 1 and 2, VCC= VDD= VIN= +5V, L1 = 22μH, SHDN= VCC, CREF= 0.1μF, TA= +25°C, unless otherwise noted.)
VOUT
5V/div
-16.8V
POWER-UP RESPONSE
(NEGATIVE CONFIGURATION)
MAX686 TOC14A
500μs
SHDN
5V/div
ISET = VCC
RL = 4.7kΩ
VOUT
5V/div
-16.8V
POWER-DOWN RESPONSE
(NEGATIVE CONFIGURATION)
MAX686 TOC14B
20ms/div
SHDN
5V/div
ISET = VCC
RL = 4.7kΩ
Reference Output. Bypass with a 0.1μF ceramic capacitor to GND.REF9
Feedback Input. Connect to an external voltage divider to set the MAX686 output voltage. See the section
Setting the Output Voltage with the DAC.FB10
Power-OK Sense Input/Power-OK Comparator Input. When the voltage applied to POK is greater than
1.125V, LCDONis low. Connect to a resistive voltage divider monitoring VIN or VOUT.POK11
IC Power-Supply InputVCC12
GroundGND13
Gate-Drive Supply for Internal MOSFET. Connect to VCC.VDD5
Set LX Current Limit. Sets the peak current limit for the internal switch. Connect to VCCfor 500mA current
limit. Connect to GND for 250mA current limit.ISET6
Shutdown Input. A logic low on SHDNplaces the MAX686 in shutdown mode. Connect to VCCfor normal
operation.SHDN7
DAC Output VoltageDACOUT8
Polarity Input. Changes polarity and threshold of FB to allow regulation of either positive or negative output
voltages. POL also changes the polarity of the DAC output such that increasing codes always increases the
magnitude of the output voltage. Set POL = GND for positive output voltage, or set POL = VCCfor negative
output voltage.
POL4
Decrement Output Voltage Input. Decrements the DAC on each rising edge such that |VOUT|decreases.DN3
PIN
Increment Output Voltage Input. Increments the DAC on each rising edge such that |VOUT|increases.UP2
Power Ground. Connect to GND.PGND1
FUNCTIONNAME
Power-OKComparator Open-Drain Output. Connect to external switch to turn LCD power on or off. See the
section Controlling the LCD Using POK and LCDON.LCDON14
No Connection. Not internally connected.N.C.15
Drain of Internal 28V, 500mA N-Channel SwitchLX16
Pin Description
DAC-Controlled Boost/Inverter
LCD Bias Supply with Internal Switch
MAX686
VCC
VDD
VOUT
22pF
VIN = 0.8V TO 27.5V
SHDN
POL
GNDPGND
22μH
DACOUT
LCDON
REF
POK
ISET
0.1μF
R3
MBR0530L
ON/OFF
DAC CONTROL
15μF
4.7μF
VCC = 2.7V TO 5.5V
0.1μF
0.1μF
Figure 1. Boost Configuration: Positive Output Voltage
MAX686
VCC
VDD
VIN ≤ |VOUT| ≤ 27.5V
MBRO530L
MBRO530L
NEGATIVE
OUTPUT
VOLTAGE
VIN = 0.8V TO 27.5V
POL
SHDN
GNDPGND
DACOUT
LCDON
REF
POK
ISET
0.1μF
2.2μF
22μH
2.2μFR1
ON/OFF
DAC CONTROL
100pF
VCC = 2.7V TO 5.5V
0.1μF
15μF
Figure 2. Negative Output Voltage Application Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX686EEE+ \|MAX686EEE	MAX	N/a	200	avai	DAC-Controlled Boost Inverter LCD Bias Supply with Internal Switch
MAX686EEE+ \|MAX686EEE	MAXIM	N/a	7	avai	DAC-Controlled Boost Inverter LCD Bias Supply with Internal Switch